摘要
针对阳极封闭式自增湿质子交换膜燃料电池(PEMFC),建立了Nafion固体电解质膜中水传递理论模型,并得出了PEMFC实现自增湿的判据。模拟了Nafion固体电解质膜厚、电池压差、电池温度及电流密度等因素对膜中水分布与电渗系数的影响,并发现了阴阳两极压差、电池温度对膜中水分布的影响随放电电流密度变化的规律。通过非对称式膜电极(MEA)的方法自制了自增湿PEMFC,实现了阳极封闭式自增湿操作,电池性能非常稳定,最高功率密度可达到1.3W/cm2以上。建立的水分布与电性能模型很好地拟合了实验放电曲线,并得到了自增湿PEMFC氧电极动力学参数,模拟出了阴阳两极压差、温度对电性能影响的极化曲线,得到了实验的证实。
Aiming at self-humidifying proton exchange membrane (PEM) fuel cell at anode blockage operating, a practical model describing the transport of water in PEM was established, and the self-humidifying criterion was also deduced. The models simulated well the effect of thickness of membrane, cell voltage, cell temperature and current density on water distribution and water drag coefficient, especially, the important fact were clarified that the effects of cell pressure drop between anode and cathode and cell temperature on water distribution in membrane will vary with current density. Furthermore, a self-humidifying PEMFC fabricated by a novel method and its anode blockage operation were pressented, the self-humidifying operation with anode blockage was very stable, and the most power density reached over 1.3 W/cm2. Finally, It was indicated that the model equations lead to good fittings of experimental current-potential data for PEMFC working with anode blockage and with Nafion 112, 115 and 117 membranes, the kinetics parameters for oxygen electrode were gain. Polarization curves of PEMFC at different operation conditions were simulated, and model equations were validated.
出处
《电源技术》
CAS
CSCD
北大核心
2003年第5期413-418,共6页
Chinese Journal of Power Sources
基金
国家重点基础理论规划项目"973"资助项目
项目号(G2000026410)
中意氢能合作项目(2001AA515080)
